kussell



J. wnussnLL, or SPRL'NGFIKELD, MASSACHUSETTS,

Leners Patent No. 80,770, 'daad August 4, 186s.

IMPROVEMENT I N LATnB-Does.

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To ALL WHOM .1T MAY CONCERTI;A

Be it known that I, J. W. RUsSELL, 'of.Springfield, in the county of Hampden, and .Commonwealth of I Massachusetts, have invented a .new and improved'Lathe-Dog; and VI do hereby declare thatthe following is a full, clear, and exact description thereof, referencebeing hadto the accompanyingdrawings, imakng a part of this specification, and to the letters of referencemarked thereon, in whichy Figure 1 is a side view of my'invention, v

Figure 2 is plan view of the same,

Figure 3 is a longitudinal section, through line A B of fig. 2, showingthe clamp separate from the shank, and

Figure 4 is a 4view of thescrew and clamp. 4

My invention relates 4to that class of machine-tools lknown as a lathe-dog, and consists of an improvement in the construction of the same, whereby any article may be held in its proper position for turning, or forgbeing operated upon in a lathe, more firmly than in the common lathe-dog, and that, too, without any danger of defacet. meut or liability to injury. v

As lathe-dogs are now constructed, it is almost impossible to hold nicely-{inished work inAthem suilciently irm and secure to operate upon it in a lathe, without more or less injury to it by abrasion, and much annoyance is experiencedI byfthe workmenon account of the work becoming 'loose in the dog while being Voperated upon, as it is only kept in place by the article being placed between the screw and side of the dog, and thescrew being then turned firmly against it. The force of the cutting-tool, or the friction of thecutting-tool` against the work, often gets the workfloose, or the screw is turned so firmly against the finished work as to deface it.

My invention is designed to obviate these objections,while it is cheap in its construction, and reliablev in its operation. b e e To enable others skilledin the art to makeand use my invention, Iwill describeits construction and mode of operation. v

In the drawingsa represents the body or shank of the dog, having the .arm b thereon, said shankf'albeling hollow, and somewhat enlarged at the end c, said Venlargement being also hollow, andof sufficient size to'admit the clamp d, which is rectangular in form, but of a suitableV thickness-to pass, into the space c within the'- enlarged part c.

The clamp d has a rectangular hole therein, or space, e, and to this portion of the .clamp is attachedthe' socket f, at one of the corners, sc that one corner of'lthe rectangular hole or space e shall be nearer the screwm than the otherswhen it is in place within the hollow shank a. The bolt 71. has a nut, y, upon Vthe end,with a collar,

s, thereon, which bears or operates against the outer end of the shank a, and said bolt also has an enlargement or annular projection, v, thereon, with a g'roove o made therein, and the lscrew-thread m is cut upon the bolt l1., which engages with the screw-thread cut in the soeketf-of the clamp d. A portion of the bore or space within the shank a. is made smaller at t, to more perfectly tit vthe bolt 7L, inl order that said bolt maybe kept mol/e securely in its proper position. A smallhole is made through "the shank a, near the armb, for the insertion of the small pin z', and a small triangular space, u, is made in the end c ofthe shank.l

Having thus described its construction, VI will now describe its mode-of operation. v

The bolt h being inserted in its place within the hollow, or bore ofthe shank a, the small piu 11 is` inserted in its hole, which pin also passes into the annular groove o in the bolt and keeps said bolt in its Yproper position.

The threaded socket f is then inserted in the space c', and by turning the screw wt .of the bolt k into the threaded socket j', said socket is drawn into its place in thespace c. If now any article to be worked upon. be passed into the rectangular space or hole aand the bolt h be turned by means of a wrench-appliedto the b nut y, the clamp Vel will be drawn farther intol the space c', until one sideof the articles passed lfirmly against the corner u, or into the triangular space u, by the opposite angle el of the clamp, or'it will be drawn-in firmly against the corner u bythe clamp d, andthe' article may 'then be operated upon by placing the arr-:n1V b inthe lathe-chuck in the usual way. I Y l somo 2 This dog may be made of anyvdesired pattern and size, but I prefer the shape sho-wn in thedrawing-s, as it may be made lighter, whileat the same time it is suilieiently strong for all .ordinary work.

Insteadof using the pin z' and groove o, a small slot might he out in the end of the shank` for the collar s.

to work in, or a small piece might be attached to `the shank a or arm b, and outside of the collar s, and the socket might perhaps be made upon lthe end of the bolt h, while the thread m might be cut upon the lstem of the clamp d. The hole e in the clamp d may be made of any other desiredv form, and the nut g'might be a vthumb-nut, if desirable. All or any of said changes might be made, without departing from the principle of operation, and would be equivalen-t to my device.` I prefer, for eoiency, tomake the tool as shown-in the drawings.

I am aware that all of the devices herein described, separately considered, yare old an'd well known, and I do not therefore claim them, or any of them; but

The combination of the screw-bolt h, having the annular vgroove o'thereon, the threaded clamp d, the hollow shank @and thearm 6, all constructed, arranged, and operating substantially as herein described, and for the purposes specified.' l

` J. 'W. RUSSELL.y

Witnesses:

T. A. CURTIS,

E. E. RICE. 

